METHOD TO DETERMINE IRREGULARITIES OF ROAD BED SURFACE Russian patent published in 2014 - IPC G01C7/00 

FIELD: measurement equipment.

SUBSTANCE: in the method to determine irregularities of road bed surface they measure clear spaces under a three-meter rack, and according to the invention, they install a ground laser scanner on a station in the controlled section of the road bed. The road bed section is scanned from the station, as a result of which they determine coordinates of points of reflection of the laser beam from the surface of the road bed; the scan is received, the above actions are carried out on stations located at 20-50 m along the road axis. Then scanning results (scans) are sent to a PC, and using special software, they register scans in it from all stations, and produce a digital point 3D model of the road bed surface, the digital point 3D model of the road bed surface is sent into special software, and a digital vector 3D model of the road bed surface is produced, using the same software, they virtually model the above three-meter rack and apply it to the produced digital 3D model of the road bed surface, in turns and continuously along the scheduled direction. This rack must contact the road bed surface in two extreme points, each time clear spaces are defined between the virtual 3D rack and the digital vector 3D model of the road bed surface via specified intervals along the rack, and irregularity of the road bed surface is calculated in accordance with the formula.

EFFECT: definition of valid and accurate values of geometric parameters of road bed surface using a ground laser scanner.

2 dwg